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Finding the Fourth Proportional to 390,353.06, 538,680.21 and 220,583.54

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Solution

The fourth proportional to 390,353.06, 538,680.21 and 220,583.54 is: 304,401.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,353.06 : 538,680.21 = 220,583.54 : x
  2. Step 2: Convert to fraction form
    390,353.06/538,680.21 = 220,583.54/x
  3. Step 3: Cross multiply
    390,353.06x = 538,680.21 × 220,583.54
  4. Step 4: Simplify right side
    390,353.06x = 118,823,984,956.34
  5. Step 5: Solve for x
    x = 118,823,984,956.34/390,353.06
  6. Step 6: Final answer
    x = 304,401.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.